Ricardo, mass 85 kg, and carmelita, who is lighter, are enjoying lake merced at dusk in a 20 kg canoe. when the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the canoe's center. ricardo notices that the canoe moved 35 cm relative to a submerged log during the exchange and calculates carmelita's mass, which she has not told him. what is it?

65.14925 kg

Explanation:

Center of mass before the exchange

Center of mass after exchange

The center of mass remains constant so

Mass of Carmelita is 65.14925 kg

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

object 2 because all the other ones are wrong